cubicweb #2110239 simplify absolute_url implementation for single-source cases [open]

Default implementation of absolute_url() uses entity cw_metainformation() (which often performs a sql query on the system source). This is only needed for multi-sources applications and single-source applications should not pay that price. Furthermore, the cw_metainformation method could probably be optimized too.

prioritynormal
typeenhancement
done in<not specified>
load0.500
load left0.500
closed by<not specified>